At 11:50 PM, Operations reported that they had found a LCW leak in the Linac gallery near a Klystron RF station (KRF7). Operations contacted the Duty Mechanic.

Operations reported at midnight that the Recycler had stashed three times during the evening shift.

Thursday Nov 20

The midnight shift began with the TeV in shot setup, with Operations monitoring the stash (6.4E10), with Pbar stacking (119.6E10), and with MiniBooNE taking beam.

Operations established store 6578 at 12:14 AM with an initial luminosity of 270.05E30.

At 12:42 AM, the Duty Mechanic reported that the Linac LCW leak was dripping onto a 480-volt breaker panel. The LCW for the Linac Klystrons had to be turned off.

The Duty Electrician reported at 1:17 AM that he had de-energized two Linac breaker panels due to the LCW leak.

The Duty Mechanic reported at 2:08 AM that he had fixed the Linac LCW leak and valved the LCW back on. The Duty Electrician reported that the components of the 480-volt breaker panels did not get wet, but he did dry out water that had collected on the bottom. Linac experts came in and turned things back on. The picture on the right shows the cracked pipe nipple that caused the leak.

Linac experts had Linac RF stations 1-7 up and running by 3:07 AM.

Operations resumed sending beam to Pbar and MiniBooNE at 3:37 AM.

At 4:53 AM, KRF1 tripped off. It reset.

Operations reported at 7:57 AM that the Recycler had stashed four times during the midnight shift.

At 8:12 AM, a Linac power supply (HT4002) tripped off for the first of five times in about 11 minutes. Experts investigated and found the supply was not able to put out enough current.

Linac experts reported at 10:31 AM that they had switched the HT4002 supply with one that was able to deliver the needed current.